Hey Gator,
I think polyairs are fairly robust, after all if they were prone to falling apart they wouldn't be as popular as they are.
If I were you I would really measure the bump stops before and after load, to see what kind of difference its making to ride height.
Also, "rolling" and "Sponginess" are usually associated with shockabsorbers. So if your springs are tolerating the weight fine (Ride height not changed too much) and you know your shocks are old you may only need to replace the shocks to tolerate the extra sway the high load is placing on it.
A cheaper option for springs is to try 130 standard springs (not the helpers necessarily) they are a bit heavier duty.
I can also recommend jumping on Les Richmond Automotive website. He has a page all about springs and suspension. VERY WORTHWHILE READING before you drop money on anything, and they let you swap springs until youre happy. Theres more than one very happy customer on this forum.


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